PPT-Center of Mass and Linear Momentum

Chapter 9 Copyright 2014 John Wiley amp Sons Inc All rights reserved 91 Center of Mass Motion of rotating objects is complicated T here is a special point for which motion . Analogies. Heat .  Mass  . (sometimes). Momentum. Analogies are useful tools. An aid to understand transfer phenomena. A sound means . t. o predict behavior of systems for which limited quantitative data are available. Lots of fun!. Win . valuable prizes!. 1.The reason padded dashboards are used in cars is that they . look nice and feel good. . decrease the impulse in a collision. . increase the force of impact in a collision. . If a system has . no external forces . acting on it (. eg. no friction), then the system is . isolated.. Total momentum in an isolated system is said to be . conserved. . . A . system. is a pair or group of objects that are interacting in some way.. We will now quantify exactly how it hits the fan.. Momentum. Momentum = product of mass X velocity. Symbol for momentum is “p” (don’t ask me why). So, p = . mv. Momentum is also a vector and points in the direction of velocity. Chapter 7. 7.1 The Impulse-Momentum Theorem. This section deals with time-varying forces affecting the motion of objects. . The effects of these forces will be discussed using the concepts of . i. mpulse and linear momentum.. (d)define . linear momentum as the product of mass and velocity. (e) define force as rate of change of momentum. (f) recall and solve problems using the relationship F = ma, appreciating. that acceleration and force are always in the same direction. A . torque. is an action that causes objects to rotate.. Torque is . not. . the same thing as force.. For rotational motion, the torque. . is what is most directly related to the motion, not the force.. Angular momentum of a rigid rotating object. Conservation of angular momentum. Lecture . 23: . Angular momentum. Translation vs rotation.  . Angular. momentum . . is fundamental quantity for . rotation. s. Compare the inertia of a semi truck and a roller skate… . Will the truck always have more inertia than the roller skate? . Will it always have more momentum than the roller skate?. Warm-Up. Estimate the amount of work the engine performed on a 1200-kg car as it accelerated at 1.2 m/s. Momentum = Mass x Velocity. p. =. mv. The SI unit for momentum is . kg·m. /s. Momentum and velocity are in the same . direction. Is a vector. Using the equation. p=. mv. At the same velocity, as mass increases – momentum increases. AP Physics 1. M. Dimler. What to Expect from this Unit. Momentum. Impulse. Impulse-Momentum Theorem. Conservation of Momentum. Collisions (Elastic, Inelastic, Perfectly Inelastic, and Explosion). Elastic Collisions-Conservation of KE. mass of an object and it’s velocity. .. . Formula:. p = . mv. mass . (kg). velocity . (m. ⋅. s. -1. ). momentum (kg. ⋅. m. ⋅. s. -1. ). Unit: kg⋅m⋅s. -1. Momentum is influenced by. What is Momentum? Unit 8 Section 3 Momentum Momentum is a property of ALL moving objects Momentum is the product of the mass and velocity of an object. Momentum = mass x velocity ( P=M x V) Momentum is labeled as kg x m/s with a direction. MOMENTUM Specification Forces and motion Forces, movement, shape and momentum know and use the relationship: momentum = mass × velocity p = m × v use the ideas of momentum to explain safety features